復(fù)合材料的界面結(jié)構(gòu)
(1. 南京理工大學(xué) 材料科學(xué)與工程系，南京 210094；
2. 東南大學(xué) 材料科學(xué)與工程系， 南京 210096)
摘 要: 借助于SEM和TEM研究了Al-TiO2-B2O3系熱擴(kuò)散反應(yīng)法合成鋁基復(fù)合材料的界面結(jié)構(gòu)。結(jié)果表明： 在B2O3與TiO2摩爾比小于1時(shí)， 增強(qiáng)相由棒狀的Al3Ti及顆粒狀的TiB2和α-Al2O3組成。 Al3Ti與基體的界面干凈、 相容性好， 在基體中分布均勻； TiB2與鋁基體界面干凈， 并存在以下位向關(guān)系： [(-)23(-)1]Al∥ [0001]TiB2, (204[TX-])Al∥（(-)24(-)20）TiB2 ，可成為基體結(jié)晶時(shí)的核心， 細(xì)化基體晶粒； α-Al2O3與鋁基體的潤(rùn)濕性差，被推擠到基體顆粒的界面呈偏聚狀態(tài)， 并存有孿晶現(xiàn)象， 其孿晶面為（111）， 孿生方向?yàn)椋?1(-)2] ］。
關(guān)鍵字: 熱擴(kuò)散反應(yīng); 界面結(jié)構(gòu); 鋁基復(fù)合材料; 位向關(guān)系; 偏聚
TiB2/Al composites fabricated by exothermic dispersion reaction method
YUAN Yun-zhan1, SUN Qiang-jin1, WU Shen-qing2
（ 1. Department of Materials Science and Engineering,
Nanjing University of Science and Technology, Najing 210094, China;
2. Department of Materials Science and Engineering,
Southeast University, Nanjing 210096, China）
Abstract: The interface structure of aluminum matrix composites fabricated by exothermic dispersion reaction method in Al-TiO2-B2O3 reaction system was investigated by using of scanning electron microscope and transmitted electron microscope. The results show that the reinforcements of the composites are consisted of α-Al2O3, TiB2 and Al-3Ti when the B2O3/TiO2 mole ratio of B2O3 to TiO2 is less than 1. Al3Ti phase in stick shape has clean interface and good crystallographic relationship with aluminum matrix. TiB2 phase also has crystallographic orientation relationships with matrix, that are ［(-)23(-)1］Al//［0001］TiB2 and (20(-)4)Al((-)24(-)20)TiB2, and they can be able to become the crystalline nucleuses of the matrix during consideration, which results in refining the aluminum matrix. At the same time, the α-Al2O3 reinforcement phase with grain shape segregates at grain boundaries of the matrix due to its bad wetting with the aluminum matrix. There are twin grain phenomenon in some α-Al2O3 particulates. The twin plane and direction are （111） and ［11(-)2］ respectively.
Key words: exothermic dispersion reaction(XD); interface structure; aluminum matrix composites; orientation relationship; segregation
